A kawaii cute science pun of a wave of ghosts - a spectral wave! The spectrum of electromagnetic waves in physics can be referred to as spectral waves.
Where to buy online
Direct from us here - see products featuring this design.
Elsewhere online
RedBubble (US)
Threadless (US)
TeePublic (US)
NeatoShop (US)
You can find the design on t-shirts in most stores, but also on other products depending on the store (e.g. hoodies, mugs, stickers, notebooks, phone cases, greeting cards, cushions, socks etc).
cute (143) puns (38) science (30)