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Observer Effect Tee
The double-slit experiment, drawn in one color and clay. A single source at the top. Waves spread through two slits and stack into an interference pattern at the bottom, with one bar picked out in clay. No words on the back. People who know, know.
On the front, small on the left chest: > usage limit reached_, with a clay cursor.
Printed DTF on a Comfort Colors 1717 garment-dyed heavyweight tee. The back print sits 3.5 in below the collar.
All sizes $40 · Black · Front + back print
Add to cart →Printed on demand by Printful.
Full description
Comfort Colors 1717 garment-dyed heavyweight cotton tee, printed DTF. The back has a wordless double-slit experiment diagram: a single source, waves through two slits, and an interference pattern with one bar in clay, placed 3.5 in below the collar. The front has a small left-chest line, "> usage limit reached_", with a clay cursor. Available in Black, Pepper and Ivory.
The blank
Comfort Colors 1717 heavyweight tee. 100% ring-spun cotton, 6.1 oz/yd² (206.8 g/m²), garment-dyed. 7/8″ double-needle topstitched collar, twill-taped neck and shoulders, double-needle armhole, sleeve and bottom hems. Printed to order with DTF by Printful. Blank sourced from Honduras.
Garment-dyed, so every shirt comes out a little different. Slight color variation is the point, not a defect.
- 100% ring-spun cotton
- Fabric weight: 6.1 oz/yd² (206.8 g/m²)
- Garment-dyed
- Relaxed fit
- 7/8″ double-needle topstitched collar
- Twill-taped neck and shoulders for extra durability
- Double-needle armhole, sleeve, and bottom hems
Fit
Unisex, relaxed fit. A thick, structured tee with room through the body. Take your usual size for the relaxed look, or size down for a closer one. Measurements are taken flat and can vary by up to 2″ (5 cm).
Care
Care for the blank (Comfort Colors 1717): wash cold (max 30°C / 86°F), inside out, with like colors. Wash it separately the first time; garment dye can bleed. Non-chlorine bleach only. Tumble dry low (max 60°C / 140°F). Don't iron. Don't dry clean.
Size chart
| Size | Length | Width | Sleeve length |
|---|---|---|---|
| S | 26.62 | 18.25 | 16.25 |
| M | 28 | 20.25 | 17.75 |
| L | 29.37 | 22 | 19 |
| XL | 30.75 | 24 | 20.5 |
| 2XL | 31.62 | 26 | 21.75 |
| 3XL | 32.5 | 27.75 | 23.25 |
| 4XL | 33.5 | 29.75 | 24.625 |
- Length: high point shoulder (beside the collar) to hem.
- Width: across the front, seam under one sleeve to seam under the other (double it for the full chest).
- Sleeve length: center back of the collar, along the shoulder seam, to the sleeve hem.
Supplier measurements; may vary by up to 2″ (5 cm). Source: Printful catalog, product 586.


