This is one that gets better the longer you look at it. It helps if you're the kind of nerd who is into midcentury science fiction, art deco posters, the language of flowers, the uses of herbs, double blind scientific studies, brain chemistry, psychiatry, psychology, and, of course, iconic quotes from the 1998 cinematic masterpiece, 
 Practical Magic. 

Here are some details:

• Museum-quality posters made on thick and durable matte paper.
• Paper thickness: 10.3 mil
• Paper weight: 5.57 oz/y² (189 g/m²)
• Giclée printing quality
• Opacity: 94%

DON'T PANIC Lavender Poster