Smell can often evoke memories both good and bad. Its influence is greater than we think, there is nothing more powerful than a breath of fresh air. The reaction we have to a particular smell is a result of our experiences – so in a calming space, a consistent, identifiable scent can make people feel centred and safe. Everyday smells can be overwhelming particularly if you are autistic, smells can be so overpowering that they may make it difficult to access a space if it's a trigger.