Based on the 1965 VW Camper Van, and pretty close to life size. This YouTube video shows how to set it up and what it looks like on the inside, although the video's music is not as groovy as we would have expected.
As it says on the box, "IT LOOKS LIKE A REGULAR BULB... BUT IT LIGHTS IN YOUR HAND." People of a certain generation still call them Uncle Fester light bulbs.
Read the shirt out loud, and if you still don't get it, listen to the theme song from the 1960s Batman TV show, especially starting at about 0:37.
Remember Harry Anderson from the TV show Night Court? He was big into magic, and marketed this fine-looking stage blood.
According to the New Yorker, "Morbidly funny … this book has something for all ages. For the grandparent, a nostalgic game of find the Who reference; the parent, a sad reminder of how cool things used to be; and for the kid, tucked into bed listening to the the most inappropriate bed time story ever, a lesson: old people are weird [and] alcohol kills."
Like paper dolls, but with magnets! You could make some strange combinations, like Kid Galahad boxing gloves with the '68 Comeback Special black outfit.